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Basic Phone Systems Explained

Where we came from and where we are now. Let's explore the differences among the different types of phone systems.

Arthur Gaplanyan

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With all the different types of phone systems out there, it can be confusing to know which is right for your business. There are three basic types of phone systems: KSU, PBX and VoIP. Each one is different when it comes to hardware and accessibility. Plus, every business is different, which makes choosing the best phone system for your company even more important. Understanding the differences can be difficult, so we’re here to help guide you. 

Key Systems Units (KSU)

This is the most basic type of phone system that uses physical copper wiring to transfer sound waves. It is similar to a home phone system because it uses phone lines. It uses a central switching device, the key system unit, to manually determine the phone-line selection. This system works well for small businesses with no more than about 40 people, due to the hardware required. The downside of this system is that it is not portable or flexible, but it is always reliable if you are onsite to make and receive calls. 

Private Branch Exchange (PBX)

The next type of system is a private branch exchange system. It is more advanced than a KSU system because it has more features such as having more phones than physical phone lines and allowing free calls between users. This system uses programmable switching devices, which allows for the automatic routing of incoming calls and uses an uninterrupted power system. With its automated features, it is suitable for bigger companies. This type of system requires esoteric installation, which can be a hassle. 

Voice over Internet Protocol (VoIP)

The newest type of phone system is a VoIP phone system also called a cloud based phone system and is the most advanced phone system by a long shot. All it needs is an internet connection through any device of your choice. The greatest thing about this phone system is that it can be used internationally since it doesn’t require the purchase of expensive on-site hardware since the hardware is hosted in data centers around the globe. This phone system works for small and large businesses alike. Since internet speeds are getting faster and faster, a cloud based phone system is the fastest and most reliable solution. Overall if you are looking for the most advanced and best phone system, a VoIP phone system is the system for your business. 


As far as a cloud based phone system goes, XENNECT is the best choice. We are able to provide the most customizable and reliable solution for businesses small and large.